Allowed only if explicitly permitted
Cedar.Thm.allowed_only_if_explicitly_permitted
Plain-language statement
A request is allowed only if it is explicitly permitted.
Exact Lean statement
theorem allowed_only_if_explicitly_permitted (request : Request) (entities : Entities) (policies : Policies) : (isAuthorized request entities policies).decision = .allow → IsExplicitlyPermitted request entities policies
Formal artifact
Lean source
theorem allowed_only_if_explicitly_permitted (request : Request) (entities : Entities) (policies : Policies) : (isAuthorized request entities policies).decision = .allow → IsExplicitlyPermitted request entities policies:= by unfold isAuthorized generalize (satisfiedPolicies .forbid policies request entities) = forbids generalize hp : (satisfiedPolicies .permit policies request entities) = permits simp only [Bool.and_eq_true, Bool.not_eq_true'] cases forbids.isEmpty <;> simp cases h₁ : permits.isEmpty <;> simp subst hp exact explicitly_permitted_iff_satisfying_permit.mpr h₁- Project
- Cedar Specification
- License
- Apache-2.0
- Commit
- 3f093947b8ae
- Source
- cedar-lean/Cedar/Thm/Authorization.lean:75-86
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Related declarations
Find? ext
Cedar.Data.Map.find?_ext
Plain-language statement
Two well-formed maps are equal if they have the same find? for every key.
Source project: Cedar Specification
Person-level attribution pending.
Find? notmem keys
Cedar.Data.Map.find?_notmem_keys
Plain-language statement
Inverse of find?_mem_toList, except that this requires wf
Source project: Cedar Specification
Person-level attribution pending.
Find? some iff in values
Cedar.Data.Map.find?_some_iff_in_values
Plain-language statement
The mp direction of this does not need the wf precondition and, in fact, is available separately as find?_some_implies_in_values above
Source project: Cedar Specification
Person-level attribution pending.